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Some ISBNs may still have been printed correctly elsewhere in the same book or corrected in later editions; if further research shows that to be the case (and that the new ISBN still refers to an edition with the same information on the same pages), then the invalid# parameter should be moved or {{Listed Invalid ISBN}} should be replaced with {}.
Note that the ISBN hyphenation rule-base is a living document. This is a maintenance category of articles with invalid ISBNs. It is often included by means of the template {{Please check ISBN}}. If you fix an ISBN please remove the template or category from the article. Many article/ISBN problems are listed at WikiProject Check Wikipedia.
invalid form – 10-digit ISBNs with the mis-positioned 'X' character invalid group id – 13-digit ISBN begins with '9790'; this prefix / group ID combination is reserved to ISMN. To resolve this error, ensure that the |isbn= value is correct, that only one ISBN is used, that the proper optional separators are used, and that no other text is ...
Entries with invalid ISBNs that are nonetheless printed in a book can be tagged with {{Listed Invalid ISBN}}. Also, if particular ISBNs in a list of ISBNs are known to be invalid, this can be indicated by providing corresponding invalid1=yes to invalid9=yes parameters in the {{ ISBN }} or {{ ISBNT }} templates.
The 25 characters of the Product Key form a base-24 encoding of the binary representation of the Product Key. The Product Key is a multi-precision integer of roughly 115 bits, which is stored in little endian byte order in an array of 15 bytes. Of these 15 bytes the least significant four bytes contain the Raw Product Key in little endian byte ...
Either hide them in a comment, or make the template produce "The ISBN x-xxx-xxxx-xx given for this publication is invalid; if you know the correct one, please consider fixing it.", with 'consider fixing it' linked to this (or another) page explaining the use of the ISBN template.
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According to the 2001 edition of the International ISBN Agency's official user manual, [49] the ISBN-10 check digit (which is the last digit of the 10-digit ISBN) must range from 0 to 10 (the symbol 'X' is used for 10), and must be such that the sum of the ten digits, each multiplied by its (integer) weight, descending from 10 to 1, is a ...