plone.formwidget.recaptcha now uses norecaptcha, which handles much of the integration by itself.
also some things got obsolete, due to changes of googles recaptcha API.

• recaptcha_ajax.js is not needed anymore: https://github.com/plone/plone.formwidget.recaptcha/blob/master/src/plone/formwidget/recaptcha/recaptcha-ajax/recaptcha_ajax.js
  remove it from portal_javascript.xml, provide an upgrade step to remove it for existing installations, ...

• AFAIK there is no image or audio captcha option anymore, only a button to click on (image captchas in some situations automatically). these should be removed...

the package is working OOTB and I removed the JS in the project where i'm using this, so for me this is low priority.

The update of Changes.rst should be handled by towncrier (https://community.plone.org/t/using-towncrier-for-changes-rst-in-plone-packages/6486).

for controlpanel, registry settings and browserlayer

Sorry, please delete the comment. I commented the wrong add-on.

@cekk what is the state on https://github.com/plone/plone.formwidget.recaptcha/blob/python3_compatibility ?
Don't forget to update classifiers ;-)

see https://travis-ci.org/plone/plone.formwidget.recaptcha/jobs/424959903

Spent 30 minutes (too much IMHO) getting out to configure this...

would b great.

The 2.1.0 release claims Python 3 compatiblity but this is not true:

    raise TypeError(_ADVICE_ERROR % 'implementer_only')
zope.configuration.xmlconfig.ZopeXMLConfigurationError: File "/home/ajung/sandboxes/onkopedia_buildout-plone5/eggs/Products.CMFPlone-5.2rc3-py3.7.egg/Products/CMFPlone/meta.zcml", line 38.4-42.10
    File "/home/ajung/sandboxes/onkopedia_buildout-plone5/parts/wsgi.py/etc/site.zcml", line 12.2-12.39
    TypeError: Class advice impossible in Python3.  Use the @implementer_only class decorator instead.
sys:1: ResourceWarning: unclosed <socket.socket fd=6, family=AddressFamily.AF_INET, type=SocketKind.SOCK_STREAM, proto=0, laddr=('0.0.0.0', 20080)>

The current master is compatible with Python 3...could we have a new release please?

@tisto @davisagli

May we have a release here? I can do this too if one provides me with permission on pypi (jensens)
@tisto @davisagli @plone/release-team
TIA!

Just declaring the widget using form:widget is not enough to use the captcha, you still need to override the edit or add forms in order to perform validation.

Providing a field, allows the captcha to be used by only declaring it in the model

The package uses standardlibs urllib for HTTP request. (https://github.com/plone/plone.formwidget.recaptcha/blob/master/src/plone/formwidget/recaptcha/norecaptcha.py) To support Python 2 and 3 the imports have to be made through six.

requests (http://docs.python-requests.org/en/master/) makes HTTP requests easier and would not be needed to be imported through six. Is already used in other places in Plone and Add-Ons, so declaring it as dependency shouldn't do any harm.