gpl1+ gpl2+ false detection

[tardyp]

Description

Some of the gpl1 rules matches very few text and have
probability to match real code.

for example:

src/licensedcode/data/rules/gpl-1.0-plus_50.RULE

only contains 'gpl1+'

On some of my scanned code, I have some variable named i_gpl1, which is incremented in a for loop, so several occurence of

i_gpl1++

scancode matches this as gpl-1.0-plus with a score of 100.

I also have another variable named i_gpl2, which also gets incremented, and the rule

src/licensedcode/data/rules/gpl-2.0-plus_188.RULE will match it as gpl-2.0-plus

[pombredanne]

This is a good example of bare words detection issues #2403

[pombredanne]

See also the related issues:

• C source code line mistaken for MPL licence  #2304
• high relevance for some very low character count rules find lots of GPL false positives #2484