from the skills section of the
srd at
www.srd.org Quote:
Check
Answering a question within your field of study has a DC of 10 (for really easy questions), 15 (for basic questions), or 20 to 30 (for really tough questions).
In many cases, you can use this skill to identify monsters and their special powers or vulnerabilities. In general, the DC of such a check equals 10 + the monster’s HD. A successful check allows you to remember a bit of useful information about that monster.
For every 5 points by which your check result exceeds the DC, you recall another piece of useful information.
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Including that type of
SRD derived information block is perfectly within the reasonable bounds of the
OGL.
EN Critter series of books does so if you are looking for an example.
As afstanton noted the Monsternomicon books do it too, though they use their monster lore version of the knowledge skill.
I think the later non-OGC MMs might use a different formula than the
srd skill section though.