[femto]

Conventional wisdom is to use a bound notebook, as a court will discount reliability if pages can be removed without leaving a trace.

[thyristan]

Why would I care about a court?

There are a hundred different issues that are more important to me than the usability of my notebook in a court proceeding. And even so, that proceeding might easily be one against you, so why would you want to produce reliable evidence against yourself?

[singleshot_]

evidence that you reduced an idea to an invention before someone else so you can exercise IP rights

[2b3a51]

Lab book with numbered pages and dated entries for semi-thought out specifications when it gets serious? But there needs to be a level of scribbling on whiteboards/backs of envelopes/napkins before that stage?

[singleshot_]

alibi