JasonVann

10.1 explain the differences among the terms security class, security level, security clearance, and security classification.

Context: BLP model, access control concept

security class - assigned to each subject and object, in the simplest form:
security level - form a strict hierarchy and are referred to as security levels (top secret -> secret -> ...)
security clearance - a subject is said to have a security clearance of a given level
security classification - an object  is said to have a security classification of a given level

10.2 what are the three rules specified by the BLP model?

JasonVann

How to Add a Watermark to Video

FFMPEG filters provide a powerful way to programmatically enhance or alter videos, and it’s fairly simple to add a watermark to a video using the overlay filter. The easiest way to install ffmpeg is to download a pre-built binary for your specific platform. Then you don’t have to worry about including and installing all the right dependencies and codecs you will be using.

Once you have ffmpeg installed, adding a watermark is as easy as passing your existing source through an overlay filter like so:

ffmpeg -i test.mp4 -i watermark.png -filter_complex "overlay=10:10" test1.mp4

Basically, we’re passing in the original video, and an overlay image as inputs, then passing it through the filter, and saving the output as test1.mp4.

JasonVann

"""
Minimal character-level Vanilla RNN model. Written by Andrej Karpathy (@karpathy)
BSD License
"""
import numpy as np

# data I/O
data = open('input.txt', 'r').read() # should be simple plain text file
chars = list(set(data))
data_size, vocab_size = len(data), len(chars)