Text fingerprinting

Hi

The problem that i have is something as follows:
We would like to find similiarity for text that has been copied from a
source. However, comparing the whole text would not be feasible (so
string matching algorithms are not useful) and so we would like to
generate some kind of a fingerprint for the texts which can be compared
against the stored corpus of fingerprints to detect copying.

I know of other techniques like watermarking etc. but are not very
useful since one who copies can easily remove such things.

Thanks in advance for any replies and/or pointers to resources.

best regards
sumedh

.

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