List 147: Unit of usage

ValueDescriptionNotesIssue numberModified in Issue
01CopiesMaximum number of copies that may be made of a permitted extract9
02CharactersMaximum number of characters in a permitted extract for a specified usage9
03WordsMaximum number of words in a permitted extract for a specified usage9
04PagesMaximum number of pages in a permitted extract for a specified usage9
05PercentageMaximum percentage of total content in a permitted extract for a specified usage9
06DevicesMaximum number of devices in ‘share group’9
07Concurrent usersMaximum number of concurrent users. NB where the number of concurrent users is specifically not limited, set the number of concurrent users to zero915
15UsersMaximum number of licensed individual users, independent of concurrency of use40
19Concurrent classesMaximum number of licensed concurrent classes of user. A ‘class’ is a group of learners attending a specific course or lesson and generally taught as a group4553
20ClassesMaximum number of licensed classes of learners, independent of concurrency of use and the number of users per class4553
31InstitutionsMaximum number of licensed institutions, independend of concurrency of use and the number of classes or individuals per institution53
08Percentage per time periodMaximum percentage of total content which may be used in a specified usage per time period; the time period being specified as another <EpubUsageLimit> Quantity11
09DaysMaximum time period in days (beginning from product purchase or activation)1136
13WeeksMaximum time period in weeks17
14MonthsMaximum time period in months17
16Hours minutes and secondsMaximum amount of time in hours, minutes and seconds allowed in a permitted extract for a specified usage, in the format HHHMMSS (7 digits, with leading zeros if necessary)42
27Days (fixed start)Maximum time period in days (beginning from the product publication date). In effect, this defines a fixed end date for the license independent of the purchase or activation date36
28Weeks (fixed start)Maximum time period in weeks36
29Months (fixed start)Maximum time period in months36
10TimesMaximum number of times a specified usage event may occur (in the lifetime of the product)11
22Times per dayMaximum frequency a specified usage event may occur (per day)36
23Times per monthMaximum frequency a specified usage event may occur (per month)35
24Times per yearMaximum frequency a specified usage event may occur (per year)35
21Dots per inchMaximum resolution of printed or copy/pasted extracts28
26Dots per cmMaximum resolution of printed or copy/pasted extracts36
11Allowed usage start pagePage number where allowed usage begins. <Quantity> should contain an absolute page number, counting the cover as page 1. (This type of page numbering should not be used where the e-publication has no fixed pagination). Use with (max number of) Pages, Percentage of content, or End page to specify pages allowed in Preview14
12Allowed usage end pagePage number at which allowed usage ends. <Quantity> should contain an absolute page number, counting the cover as page 1. (This type of page numbering should not be used where the e-publication has no fixed pagination). Use with Start page to specify pages allowed in a preview14
17Allowed usage start timeTime at which allowed usage begins. <Quantity> should contain an absolute time, counting from the beginning of an audio or video product, in the format HHHMMSS or HHHMMSScc. Use with Time, Percentage of content, or End time to specify time-based extract allowed in Preview4244
18Allowed usage end timeTime at which allowed usage ends. <Quantity> should contain an absolute time, counting from the beginning of an audio or video product, in the format HHHMMSS or HHHMMSScc. Use with Start time to specify time-based extract allowed in Preview4244
98Valid fromThe date from which the usage constraint applies. <Quantity> is in the format YYYYMMDD46
99Valid toThe date until which the usage constraint applies. <Quantity> is in the format YYYYMMDD46