matplotlib Code

"""
Use a Text as a watermark
"""
import numpy as np
#import matplotlib
#matplotlib.use('Agg')

import matplotlib.pyplot as plt

fig = plt.figure()

ax = fig.add_subplot(111)
ax.plot(np.random.rand(20), '-o', ms=20, lw=2, alpha=0.7, mfc='orange')
ax.grid()

# position bottom right
fig.text(0.95, 0.05, 'Property of MPL',
         fontsize=50, color='gray',
         ha='right', va='bottom', alpha=0.5)

plt.show()