[b1n]

I've invented a replacement for the PDF format.

It's called Locked Markdown. `*.lmd`.

It provides 98% of the functionality most people use PDFs for, without all the extra bullshit.

The Spec:

- The most popular Markdown Spec (git flavour?)

- At the top of the page place a hash sum of the markdown below a marker on the page.

LMD Reader:

- Prevents editing the markdown.

- Warns user if the hash sum is not valid.

Example:

```lmd

sha256 77ec0f678315f8a207c3501137e1dfc9642b79a9c93e21807df7b5242846c05c

-------------------------------

# Header 1

Paragraph of text about how bloated the PDF format is.

```

Zip .lmd together with images/videos if required.

[teruakohatu]

What is stopping me just unzipping it, altering the file, hashing the file below the header and then zipping it back up?

[_def]

Instead of a hash sum you could use a crypto signature. Makes it even more useful: if someone legitimately alters the file, you could verify who it was. While you're at it, make it a zipped git repository and you have edit history for free

[thatcat]

not sure, but maybe hashing the media files to be zipped and including that hashlist in the hashed lmd would prevent that? or at least allow for a verification that they werent altered

[GrantMoyer]

DMCA and Trademarks

[hehbot]

Locked Markdown sounds so close to my favourite defense contractor

[ale42]

Does it do vector graphics and custom fonts?