[tomsem]

I don't think notes are limited (those are your intellectual property) but publishers can set a limit on number of highlights (a so called 'clipping limit'). Unfortunately there's no way of knowing what the limit in a given book is without crashing into it. Note that on the Touch and Paperwhite you normally create both when you add a note, but you can delete the highlight and leave the note. It baffles me that publishers impose this, it is as if they want to punish the very readers who love their books the most, and if this is intended as an anti-piracy measure it is completely ineffective.

Another reason to check out Apprentice Alf.

I would be very curious to see what a survey would show about how prevalent this practice is and what the typical limit is, whether it varies from publisher to publisher etc.