LastEdited,Title,Description
"2020-11-06 13:07:41","ICC profile is version 4.0 or newer","Beginning with PDF 1.5 (Acrobat 6) version 4 ICC profiles are supported for ICC based color spaces. PDF/X-1a, PDF/X-3 and PDF/A-1 prohibit the use of version 4 ICC profiles, instead version 2 ICC profiles must be used where needed."
"2020-11-06 13:11:41","Transparency used (filled object with ca value smaller than 1.0)","Filled object uses constant alpha with a value smaller than 1.0 which implies transparency. Beginning with PDF 1.4 (Acrobat 5) transparency is supported. Some PDF-based ISO standards prohibit the use of transparency. Acrobat PDF Optimizer may be used in order to flatten transparency."
"2020-11-06 13:11:41","Page does not have MediaBox","The PDF specification requires that each page defines a Media Box."
"2020-11-06 13:11:41","RGB used for alt. color but PDF/X OutputIntent not RGB","If the destination profile of the OutputIntent in a PDF file is not RGB, PDF/X prohibits an alternate color space that is DeviceRGB."
"2020-11-06 13:11:41","Document title empty/missing","The title entry in a PDF document is required by PDF/X. Go to the File menu and select the Properties... entry. You can enter the title in the Title field then."
"2020-11-06 13:11:41","RGB used but PDF/X OutputIntent not RGB","If the destination profile of the OutputIntent in a PDF file is not RGB, PDF/X prohibits that an object uses DeviceRGB."
"2020-11-06 13:11:41","Halftone not of type 1 or 5","Halftone entries other than type 1 or 5 are prohibited by PDF/X."
"2020-11-06 13:11:41","OutputIntent Info contains XML code","The OutputIntent Info entry contains XML code instead of plain text providing additional information about the intended printing condition."
"2020-11-06 13:11:41","Document creation date missing","The creation date entry in a PDF document is required by some PDF/X standards."
"2020-11-06 13:11:41","OutputIntent profile not 'prtr'","The ICC profile embedded in an OutputIntent must be of type 'prtr' - it must be a printer profile."
"2020-11-06 13:11:42","Bleed box present and viewer preferences not MediaBox or BleedBox","Some PDF/X standards require that if a page contains a BleedBox entry there must not be any other viewer preferences entries in the document other than MediaBox or BleedBox. "
"2020-11-06 13:11:42","Bits per color component > 8","Beginning with PDF 1.5 (Acrobat 6) images with a bit depth of 16 bits per component are supported. PDF/X-1a, PDF/X-3 and PDF/A-1 prohibit the use of 16 bit images."
"2020-11-06 13:11:42","RegistryName not of type string","PDF/X requires that the RegistryName entry in an OutputIntent is of type string."
"2020-11-06 13:11:42","Trapped key not of type name","PDF/X requires that the value for the Trapped key is of type name."
"2020-11-06 13:11:42","OutputIntent Info not of type string","PDF/X requires that the OutputIntent Info entry is of type string."
"2020-11-06 13:11:42","Alternate image is default for printing","A PDF may contain alternate images which are usually being used in order to speed up interactive display. Alternate images should not be default for printing. ISO standards for data exchange in prepress (PDF/X) prohibit that alternate images are default for printing."
"2020-11-06 13:11:42","Interactive form field inside page area","Determines whether interactive form fields are located (completely or partially) within the areas designated by the BleedBox (trim size of a page plus bleed area) or TrimBox (trim size of a page). PDF/X prohibits interactive form fields inside this area."
"2020-11-06 13:11:42","TrapNet process color model CMYK but destination profile not CMYK","TrapNet PCM CMYK but destination profile not CMYK"
"2020-11-06 13:11:42","Compressed object streams used","Beginning with PDF 1.5 (Acrobat 6) compressed object streams are supported. Compressed object streams are prohibited in any PDF/X-1a, PDF/X-3 and PDF/A-1 file."
"2020-11-06 13:11:43","Transparency used (blend mode not “Normal” nor “Compatible”)","A blend mode other than “Normal“ or “Compatible” makes the respective objects appear transparent. Beginning with PDF 1.4 (Acrobat 5) transparency is supported. Some PDF-based ISO standards prohibit the use of transparency. Acrobat PDF Optimizer may be used in order to flatten transparency."
"2020-11-06 13:11:43","Document is encrypted","Even if an encrypted file does not require a password, many applications (incl. Photoshop and InDesign) won't allow one to do anything with the file. In addition, PDF/X and other PDF-based ISO standards prohibit encryption."
"2020-11-06 13:11:43","Document modification date missing","The modification date entry in a PDF document is required by PDF/X."
"2020-11-06 13:11:43","Transfer function in halftone dictionary improperly used","PDF-based ISO standards prohibit the use of transfer functions in halftone dictionaries if not explicitly required by the PDF specification for the respective halftone type. (If the halftone dictionary is a component of a type 5 halftone and represents either a non primary or nonstandard primary color component a transfer function is required.)"
"2020-11-06 13:11:43","TrapNet annotation present but Trapped key not set to true","If TrapNet annotations are present in a PDF/X file, the Trapped key must be set to True."
"2020-11-06 13:11:43","Number of PDF/X OutputIntent entries > 1","A valid PDF/X file must not have more than one PDF/X OutputIntent entry."
"2020-11-06 13:11:43","LZW compression used","Due to patent and licensing issues LZW compression is prohibited in all PDF-based ISO standards."
"2020-11-06 13:11:43","PrinterMark annotation inside TrimBox","Some PDF/X standards prohibit the presence of PrinterMark annotations inside the TrimBox area."
"2020-11-06 13:11:43","Page does not have TrimBox or ArtBox","Either ArtBox or TrimBox should be defined for pages in a PDF file that are used in prepress. PDF/X ISO standards require the presence of one of these boxes."
"2020-11-06 13:11:44","HalftoneName key present","The Halftone name key is prohibited by PDF/X."
"2020-11-06 13:11:44","CMYK used but PDF/X OutputIntent not CMYK","Some PDF-based ISO standards require that if DeviceCMYK is used the output intent must be defined for CMYK."
"2020-11-06 13:11:44","Page boxes not nested properly","ISO standards for PDF/X require that MediaBox, BleedBox and TrimBox (or sometimes ArtBox) are nested properly."
"2020-11-06 13:11:44","Document is damaged and needs repair","The PDF document is damaged. While Acrobat always tries to repair the document when it is opened, there is no guarantee that the document can be processed reliably."
"2020-11-06 13:11:44","Alternate color space is device independent but no PDF/X destination profile present","If an OutputIntent does not contain a destination profile, PDF/X-3 prohibits an alternate color space that is device independent."
"2020-11-06 13:11:44","Document contains JavaScripts","JavaScripts are an advanced feature in Acrobat to add interactivity to PDF pages as well as to form fields. They are prohibited in some PDF-based ISO standards."
"2020-11-06 13:11:44","Scaling factor used","Beginning with PDF 1.6 (Acrobat 7) the page property ""UserUnits"" - a scaling factor for the page coordinate space - is supported. By means of the UserUnits scaling factor page sizes beyond the 200 by 200 inches as supported until Acrobat 6 are now possible. UserUnits are not supported by some PDF-based ISO standards."
"2020-11-06 13:11:44","Transparency used (soft mask)","A transparent soft mask is present. Beginning with PDF 1.4 (Acrobat 5) transparency is supported. Some PDF-based ISO standards prohibit the use of transparency. Acrobat PDF Optimizer may be used in order to flatten transparency."
"2020-11-06 13:11:44","OpenType font used","Text uses OpenType font. Support for OpenType fonts was introduced in PDF 1.6 (Acrobat 7). Some PDF-based ISO standard prohibit the use of OpenType fonts."
"2020-11-06 13:11:45","Document ID missing","The Document ID in a PDF document is required by some PDF/X standards."
"2020-11-06 13:11:45","TrapNet has FontFauxing set to true","FontFauxing for a TrapNet annotation is prohibited by PDF/X."
"2020-11-06 13:11:45","ICC profile is not valid","At least one ICC profile is syntactically incorrect."
"2020-11-06 13:11:45","Image has OPI information","OPI information is used in order to replace embedded images with external images. The use of OPI information is prohibited in PDF-based ISO standards."
"2020-11-06 13:11:45","TrapNet process color model RGB but destination profile not RGB","Some PDF-based ISO standards require that if a TrapNet annotation is present, it must use the same color space as the destination profile in the output intent."
"2020-11-06 13:11:45","OutputConditionIdentifier not of type string","PDF/X requires that the OutputConditionIdentifier is of type string."
"2020-11-06 13:11:45","PDF/X version key (GTS_PDFXVersion) not of type string","The GTS_PDFXVersion key contains the name of the ISO standard with which the PDF claims to be compliant. It must be of type string."
"2020-11-06 13:11:45","OutputConditionIdentifier missing","The OutputConditionIdentifier is required by PDF/X."
"2020-11-06 13:11:45","CMYK used for alt. color but PDF/X OutputIntent is not CMYK","If the destination profile of the OutputIntent in a PDF file is not CMYK, PDF/X prohibits an alternate color space that is DeviceCMYK."
"2020-11-06 13:11:46","Image and it’s alternate do not have same size and position","An image may have an alternate representation (usually such alternate images use smaller resolution or high compression and their intention is to speed up page display). Some PDF/X ISO standards require that image and it’s alternate have the same size and position."
"2020-11-06 13:11:46","Font not embedded","Fonts should always be embedded for prepress files. Fonts must be embedded for PDF/X-1 and PDF/X-3 files."
"2020-11-06 13:11:46","Page is a separated plate","This page is a separated plate, it does contain only information for one plate. The use of separated pages is prohibited in some PDF/X standards."
"2020-11-06 13:11:46","Trapped key not true or false","PDF/X requires that the Trapped key is set to either true or false."
"2020-11-06 13:11:46","Document uses compression type prohibited in PDF/X-1a or PDF/X-3","A data stream in the document uses a filter type prohibited in PDF/X-1a or PDF/X-3. These ISO standards allow for: ZIP (FlateDecode), RunLengthDecode, CCITTFaxDecode, JPEG (DCTDecode) and ASCII (ASCIIHexDecode or ASCII85Decode)."
"2020-11-06 13:11:46","PostScript operator embedded","Embedded PostScript is not allowed PDF in some based ISO standards."
"2020-11-06 13:11:46","File specification present","File specifications in a PDF document are prohibited by some PDF-based ISO standards."
"2020-11-06 13:11:46","OutputIntent for PDF/X missing","PDF/X requires the presence of an OutputIntent with a subtype of GTS_PDFX."
"2020-11-06 13:11:47","Font is not valid","At least one embedded font is syntactically incorrect."
"2020-11-06 13:11:47","3D annotation used","Beginning with PDF 1.6 (Acrobat 7) annotations of type ""3D"" are supported. However, 3D annotations are prohibited by some PDF-based ISO standards."
"2020-11-06 13:11:47","DeviceGray used for alt. color but PDF/X OutputIntent not Gray or CMYK","Some PDF-based ISO standards require that if DeviceGray is used the output intent must be defined either for CMYK or for Gray. In this case a spot color uses an alternate color definition in DeviceGray."
"2020-11-06 13:11:47","Transparency used (transparency group)","A transparency group entry is present. Beginning with PDF 1.4 (Acrobat 5) transparency is supported. Some PDF-based ISO standards prohibit the use of transparency. Acrobat PDF Optimizer may be used in order to flatten transparency."
"2020-11-06 13:11:48","Page has TrimBox and ArtBox (but must only have one of this)","Some PDF-based ISO standards require that a PDF has either a TrimBox or an ArtBox but not both."
"2020-11-06 13:11:48","Alternate image uses compression type prohibited in PDF/X-1a or PDF/X-3","An alternate image uses a filter type prohibited in PDF/X-1a and PDF/X-3. This ISO standards allow for: ZIP (FlateDecode), RunLengthDecode, CCITTFaxDecode,  and ASCII (ASCIIHexDecode or ASCII85Decode)."
"2020-11-06 13:11:48","License for TrueType font does not permit embedding","TrueType fonts may have a flag indicating whether their license permits embedding. Some ISO standards explicitly require that these fonts shall not be used even if they are nevertheless embedded."
"2020-11-06 13:11:48","PostScript embedded (PostScript Form XObject)","Page description contains embedded PostScript (PostScript Form XObject)"
"2020-11-06 13:11:48","Glyphs missing in embedded font","All fonts embedded into a PDF have to contain glyphs for all characters used in the PDF. This is required by some PDF-based ISO standards such as PDF/X."
"2020-11-06 13:11:48","PDF/X version key (GTS_PDFXVersion) missing","The GTS_PDFXVersion key is required by PDF/X."
"2020-11-06 13:11:48","OutputCondition contains XML code","The OutputCondition contains XML code instead of plain text describing the intended printing condition."
"2020-11-06 13:11:49","Image is not valid","The data stream for at least one image is syntactically incorrect."
"2020-11-06 13:11:49","TrapNet process color model Gray but destination profile not Gray","TrapNet process color space is Gray. Some PDF-based ISO standards require that if a TrapNet annotation is present, it must use the same color space as the destination profile in the output intent."
"2020-11-06 13:11:49","Document contains actions","Actions in a PDF file are often used to add interactivity. They are prohibited in some PDF-based ISO standards."
"2020-11-06 13:11:49","PDF/X entry is not “PDF/X-3:2003”","The PDF/X-1a or PDF/X-3 entry in the document information (”GTS_PDFXVersion key”) must contain a correct value for identification of the respective PDF/X standard."
"2020-11-06 13:11:49","Has TR2 (transfer curve) entry","The PDF file contains a TR2 (transfer curve) entry. Some PDF/X standards prohibit the use of this entry."
"2020-11-06 13:11:49","File size is above 2GB","Up and until Acrobat 6 the size of a PDF file was limited to 2 GB. Beginning with Acrobat 7 file sizes above 2 GB are supported."
"2020-11-06 13:11:49","Transparency used (soft mask in image)","A transparent soft mask is present. Beginning with PDF 1.4 (Acrobat 5) transparency is supported. Some PDF-based ISO standards prohibit the use of transparency. Acrobat PDF Optimizer may be used in order to flatten transparency."
"2020-11-06 13:11:49","Transfer curve used","Transfer curves are prohibited in some PDF-based ISO standards. Use Acrobat Distiller 5's ""Apply transfer curves"" to avoid transfer curves in PDF files without compromising page contents."
"2020-11-06 13:11:49","ICC profile missing in PDF/X OutputIntent (no RegistryName entry)","Some PDF/X standards require that the PDF/X Output Intent if present contains a destination profile."
"2020-11-06 13:11:50","Halftone phase entry present","The halftone phase (HTP) entry is prohibited by PDF/X standards."
"2020-11-06 13:11:50","Image uses compression type prohibited in PDF/X-1a or PDF/X-3","An image uses a filter type prohibited in PDF/X-1a and PDF/X-3. This ISO standards allow for: ZIP (FlateDecode), RunLengthDecode, CCITTFaxDecode,  and ASCII (ASCIIHexDecode or ASCII85Decode)."
"2020-11-06 13:11:50","Syntax problem: Unknown operator in page description","This condition filters for operators that are not defined in the PDF specification and almost always will cause errors."
"2020-11-06 13:11:50","Layers used","Beginning with PDF 1.5 (Acrobat 6) layers (called ""optional content"" in the PDF specification) are supported. They are not allowed in some PDF-based ISO standards."
"2020-11-06 13:11:50","Page uses compression type prohibited in PDF/X-1a or PDF/X-3","A page uses a filter type prohibited in PDF/X-1a or PDF/X-3. This ISO standards allow for: ZIP (FlateDecode), RunLengthDecode, CCITTFaxDecode, JPEG (DCTDecode) and ASCII (ASCIIHexDecode or ASCII85Decode)."
"2020-11-06 13:11:50","TrapNet Annotation error","A TrapNet annotation is a means of defining trapping for PDF files. There are some syntactical requirements for these annotations as they belong to the print content while most other annotations do not. If a TrapNet annotation error occurs it is probable that the trapping will not be applied accordingly when the PDF is printed."
"2020-11-06 13:11:50","OutputCondition not of type string","PDF/X requires that the OutputCondition is of type string."
"2020-11-06 13:11:50","Stream size is above 2 GB","Up and until Acrobat 6 the size of a stream in a PDF file was limited to 2 GB. Beginning with Acrobat 7 streams with a size above 2 GB are supported."
"2020-11-06 13:11:50","OutputConditionIdentifier contains XML code","The OutputConditionIdentifier contains XML code instead of plain text with the identifier entry."
"2020-11-06 13:11:51","Transparency used (stroked object with CA value smaller than 1.0)","Stroked object uses constant alpha with a value smaller than 1.0 which implies transparency. Beginning with PDF 1.4 (Acrobat 5) transparency is supported. Some PDF-based ISO standards prohibit the use of transparency. Acrobat PDF Optimizer may be used in order to flatten transparency."
"2020-11-06 13:11:51","DeviceGray used but OutputIntent not Gray or CMYK","Some PDF-based ISO standards require that if DeviceGray is used the output intent must be defined either for CMYK or for Gray."
"2020-11-06 13:11:51","Annotation inside page area (and not of type TrapNet or PrinterMark)","Annotations inside the trim or bleed area of a page may cause unpredictable print output. They are not allowed in PDF/X files."
"2020-11-06 13:11:51","ICC profile missing in PDF/X OutputIntent (RegistryName not www.color.org)","Some PDF/X standards require that the PDF/X Output Intent contains a destination profile. If this is not the case the intended output condition must match a characterization name at the ICC registry (www.color.org)."
"2020-11-06 13:11:51","PostScript embedded (XObject)","Embedded PostScript is not allowed in some PDF-based ISO standards."
"2020-12-09 21:06:45","Ink coverage is above 290%","This page has ink coverage above 290% and may cause problems due to the high amount of ink being applied to the paper when printed."
"2020-12-09 21:06:46","Document generates more than 4 plates","Document generates more than four plates when separations are created."
"2020-12-09 21:06:46","Spot color is used","There are objects using spot color."
"2020-12-09 21:14:22","Hairline (0.125 pt)","Hairlines may disappear when they are printed. Only lines within the TrimBox are listed."
"2020-12-09 21:14:22","Text is smaller than 5 pt","Identifies very small text with a size of less than 5 pt. It might be difficult to print small text in the selected printing process."
"2020-12-09 21:14:23","Resolution of color and grayscale images is lower than 300 pixels per inch","Continuous tone image resolution lower than specified"
"2020-12-09 21:16:31","Page is empty","Page is empty"
"2020-12-09 21:16:31","At least one page is empty","At least one page is empty"
"2020-12-10 22:08:06","PDF version newer than 1.2","If the version of a PDF document is newer than the PDF version supported by a given version of Adobe Acrobat or Adobe Reader, a warning message will be displayed. The PDF version alone though does not necessarily cause issues, as long as no features are used from a newer PDF version."
"2020-12-10 22:09:03","PDF/X-4 entry missing or incorrect","PDF/X-4 requires that the PDF/X-4 entry is present in the document's XMP Metadata."
"2020-12-10 22:09:03","Trapped key not present in XMP metadata","There is no trapped key present in the XMP metadata. The trapped key indicates whether the PDF has been trapped or not. PDF/X-4 requires that the   Trapped entry is present in the document's XMP Metadata in the user defined ‘pdfx” name space."
"2020-12-10 22:09:04","XMP does not have a VersionID entry in the XMP Media Management Schema","The VersionID in the XMP Media Management Schema (xmpMM) is the version identifier for respective resource. This entry is required by some PDF-based ISO standards for file identification."
"2020-12-10 22:09:04","Page does not have TrimBox or ArtBox UPD","Either ArtBox or TrimBox should be defined for pages in a PDF file that are used in prepress. PDF/X ISO standards require the presence of one of these boxes."
"2020-12-10 22:19:26","Object uses RGB","Object uses RGB (DeviceRGB)."
"2020-12-10 22:19:26","Object uses RGB (Copy 1)","Object uses RGB (DeviceRGB)."
"2020-12-10 22:19:27","Image is not CMYK or spot","Finds images that use colors other than DeviceCMYK or spot colors - i.e. any images using device independent color or DeviceRGB."
"2020-12-10 22:19:27","Image is not CMYK","Finds images that use colors other than DeviceCMYK."
"2020-12-11 17:38:30","XMP does not have a RenditionClass entry in the XMP Media Management Schema","The RenditionClass entry in the XMP Media Management Schema (xmpMM) is used for derived versions of a media resource. If the file is not a derived version it should be present but set to “default”. This entry is required by some PDF-based ISO standards for file identification."
"2020-12-11 17:38:30","Resolution of color and grayscale images is higher than 450 pixels per inch","Continuous tone image resolution higher than specified"
"2020-12-11 17:38:30","XMP does not have “title” entry in the Dublin Core Schema","This entry of the predefined Dublin Core Schema defines the title of the document. It is required by some PDF-based ISO standards."
"2020-12-11 17:38:31","Text uses artificial bold style","Lists all text objects using artificial bold style."
"2020-12-11 17:40:14","Font not embedded","Font is not embedded in the PDF file."
"2020-12-11 17:40:14","Font not embedded (Copy 1)","Fonts should always be embedded for prepress files. Fonts must be embedded for PDF/X-1 and PDF/X-3 files."
"2020-12-11 17:40:14","Font not embedded (and text rendering mode not 3)","In order to make sure that all characters in a PDF are accurately displayed all required fonts should be embedded into a PDF file. Some PDF-based ISO standards require that all fonts used for text are embedded unless that text uses text rendering mode 3 (invisible text)."
"2020-12-11 17:41:25","Document uses compression type prohibited in PDF/X-4","A data stream in the document uses a filter type prohibited in PDF/X-4. This ISO standards allows for: ZIP (FlateDecode), RunLengthDecode, CCITTFaxDecode, JBIG2Decode, JPEG (DCTDecode), JPEG2000 (JPXDecode) and ASCII (ASCIIHexDecode or ASCII85Decode)."
"2020-12-11 17:41:25","Image uses compression type prohibited in PDF/X-4","An image uses a filter type prohibited in PDF/X-4. This ISO standards allows for: ZIP (FlateDecode), RunLengthDecode, CCITTFaxDecode, JBIG2Decode, JPEG (DCTDecode), JPEG2000 (JPXDecode) and ASCII (ASCIIHexDecode or ASCII85Decode)."
"2021-05-06 11:56:35","Certificate not present","There is no XMP metadata for a Certificate in the PDF document."
"2021-05-06 11:56:56","Certificate is valid and reports warnings","The Certificate is valid and reports warnings."
"2021-03-02 13:43:24","Optional content configuration dictionary has no Name entry","The name entry of an optional content configuration dictionary (OCCD) is used to identify the respective view state. Some PDF-based ISO standards (namely PDF/X-4) require that each OCCD has a name entry which is unique throughout the PDF."
"2021-03-02 13:43:24","White vector object is not set to knock out inside BleedBox (stroked)","White objects should be set to knock out, as otherwise they may simply disappear when the PDF is printed. This check lists vector objects inside the TrimBox using white for stroke."
"2021-03-02 13:43:24","White object is not set to knock out","White objects should be set to knock out, as otherwise they may simply disappear when the PDF is printed."
"2021-03-02 13:43:25","White vector object is not set to knock out","White objects should be set to knock out, as otherwise they may simply disappear when the PDF is printed. This check lists vector objects inside the TrimBox using white."
"2021-03-02 13:43:25","Page boxes not nested properly (Copy 1)","ISO standards for PDF/X require that MediaBox, BleedBox and TrimBox (or sometimes ArtBox) are nested properly."
"2021-03-02 13:43:25","White vector object is not set to knock out inside BleedBox","White objects should be set to knock out, as otherwise they may simply disappear when the PDF is printed. This check lists vector objects inside the TrimBox using white."
"2021-03-02 13:43:25","White object is not set to knock out (stroked)","White objects should be set to knock out, as otherwise they may simply disappear when the PDF is printed."
"2021-03-02 13:43:25","Has more than 4 spot colors","Document has more spot colors than specified."
"2021-03-02 13:43:25","White vector object is not set to knock out (stroked)","White objects should be set to knock out, as otherwise they may simply disappear when the PDF is printed. This check lists vector objects inside the TrimBox using white for stroke."
"2021-05-06 11:57:23","Certificate is valid and reports success","The Certificate is valid and reports success."
"2021-05-06 11:47:55","Document modified since Preflight Certificate was applied","The PDF document has been modified since the Preflight Certificate was applied."
"2021-09-04 16:35:50","XMP History entry has no ""parameters"" field","The XMP History entry contains a high-level list of user actions that resulted in the respective PDF. The ""parameters"" field contains some additional description of an action. Some PDF based ISO standards require that this entry is present in all XMP History entries."
"2021-09-04 16:35:50","XMP property neither predefined nor defined in extension schema (XMP 2005)","In XMP metadata for a page, an XMP metadata property is used, which is not predefined in the XMP specification dated September 2005. There is an XMP extension schema present in the PDF but it does not contain a definition for this property. Some PDF based ISO standards require that all XMP metadata properties are either predefined or defined in an embedded extension schema."
"2021-09-04 16:38:41","Preflight Certificate is not valid or reports errors","The Preflight Certificate is not valid or reports errors."
"2021-10-05 18:07:30","Missing Extended graphic state ""GS1""",
"2021-10-05 18:07:30","Missing Font ""F2""",
"2021-10-05 18:07:30","Missing Font ""F3""",
"2021-10-05 18:07:30","Missing Font ""F4""",
"2021-10-20 09:29:08","Spot color representations are inconsistent","A spot color uses different representations throughout the PDF. This may lead to unpredictable results if the spot color is converted to CMYK (or RGB). Some PDF-based ISO standards require that the representations are consistent."
"2023-06-06 17:11:11","PDF version is newer than 1.3","The PDF format version number in the PDF file header is greater than 1.3."